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A set of good high flow Headers,or a high flow cold air intake will definatly improve your engines performance,but i doubt it would improve gas mileage any.Out of all the performance mods I have done to my Vic only the Flowmaster 30 Series Exhaust has improved my gas mileage any,after I had it installed I got about 3-4mpg more than before and about 10-15hp more,the cold air intake and big bore throttle body I installed only helped to use more gas,but improved performance by about 15+hp.You can also try running a higher octane gas,I run 93 octane in my Vic and I get about 20-28mpg,lead foot,upgrades and all.
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